Answer:
0.189
Explanation:
Aqueous solution only has ammonia and water in it. Assume total mass of 100 g
Meaning mass of ammonia is 18% of 100 g = 18 g
Mass of water is 82% of 100 g = 82g
Number of moles of ammonia = mass / molar mass ammonia =18/17 = 1.059
Number of moles of water = mass / molar mass water = 82/18 =4.556
Mole fraction ammonia = 1.059 / (1.059+4.556) = 0.189
